1 files changed, 198 insertions, 0 deletions
diff --git a/extensions/browser/api/sockets_tcp/tcp_socket_event_dispatcher.cc b/extensions/browser/api/sockets_tcp/tcp_socket_event_dispatcher.cc
new file mode 100644
index 0000000..11d4cee
--- /dev/null
+++ b/extensions/browser/api/sockets_tcp/tcp_socket_event_dispatcher.cc
@@ -0,0 +1,198 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "extensions/browser/api/sockets_tcp/tcp_socket_event_dispatcher.h"
+
+#include "extensions/browser/api/socket/tcp_socket.h"
+#include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/browser/extensions_browser_client.h"
+#include "net/base/net_errors.h"
+
+namespace {
+int kDefaultBufferSize = 4096;
+}
+
+namespace extensions {
+namespace core_api {
+
+using content::BrowserThread;
+
+static base::LazyInstance<
+    BrowserContextKeyedAPIFactory<TCPSocketEventDispatcher> > g_factory =
+    LAZY_INSTANCE_INITIALIZER;
+
+// static
+BrowserContextKeyedAPIFactory<TCPSocketEventDispatcher>*
+TCPSocketEventDispatcher::GetFactoryInstance() {
+  return g_factory.Pointer();
+}
+
+// static
+TCPSocketEventDispatcher* TCPSocketEventDispatcher::Get(
+    content::BrowserContext* context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  return BrowserContextKeyedAPIFactory<TCPSocketEventDispatcher>::Get(context);
+}
+
+TCPSocketEventDispatcher::TCPSocketEventDispatcher(
+    content::BrowserContext* context)
+    : thread_id_(Socket::kThreadId), browser_context_(context) {
+  ApiResourceManager<ResumableTCPSocket>* manager =
+      ApiResourceManager<ResumableTCPSocket>::Get(browser_context_);
+  DCHECK(manager)
+      << "There is no socket manager. "
+         "If this assertion is failing during a test, then it is likely that "
+         "TestExtensionSystem is failing to provide an instance of "
+         "ApiResourceManager<ResumableTCPSocket>.";
+  sockets_ = manager->data_;
+}
+
+TCPSocketEventDispatcher::~TCPSocketEventDispatcher() {}
+
+TCPSocketEventDispatcher::ReadParams::ReadParams() {}
+
+TCPSocketEventDispatcher::ReadParams::~ReadParams() {}
+
+void TCPSocketEventDispatcher::OnSocketConnect(const std::string& extension_id,
+                                               int socket_id) {
+  DCHECK(BrowserThread::CurrentlyOn(thread_id_));
+
+  StartSocketRead(extension_id, socket_id);
+}
+
+void TCPSocketEventDispatcher::OnSocketResume(const std::string& extension_id,
+                                              int socket_id) {
+  DCHECK(BrowserThread::CurrentlyOn(thread_id_));
+
+  StartSocketRead(extension_id, socket_id);
+}
+
+void TCPSocketEventDispatcher::StartSocketRead(const std::string& extension_id,
+                                               int socket_id) {
+  DCHECK(BrowserThread::CurrentlyOn(thread_id_));
+
+  ReadParams params;
+  params.thread_id = thread_id_;
+  params.browser_context_id = browser_context_;
+  params.extension_id = extension_id;
+  params.sockets = sockets_;
+  params.socket_id = socket_id;
+
+  StartRead(params);
+}
+
+// static
+void TCPSocketEventDispatcher::StartRead(const ReadParams& params) {
+  DCHECK(BrowserThread::CurrentlyOn(params.thread_id));
+
+  ResumableTCPSocket* socket =
+      params.sockets->Get(params.extension_id, params.socket_id);
+  if (!socket) {
+    // This can happen if the socket is closed while our callback is active.
+    return;
+  }
+  DCHECK(params.extension_id == socket->owner_extension_id())
+      << "Socket has wrong owner.";
+
+  // Don't start another read if the socket has been paused.
+  if (socket->paused())
+    return;
+
+  int buffer_size = socket->buffer_size();
+  if (buffer_size <= 0)
+    buffer_size = kDefaultBufferSize;
+  socket->Read(buffer_size,
+               base::Bind(&TCPSocketEventDispatcher::ReadCallback, params));
+}
+
+// static
+void TCPSocketEventDispatcher::ReadCallback(
+    const ReadParams& params,
+    int bytes_read,
+    scoped_refptr<net::IOBuffer> io_buffer) {
+  DCHECK(BrowserThread::CurrentlyOn(params.thread_id));
+
+  // If |bytes_read| == 0, the connection has been closed by the peer.
+  // If |bytes_read| < 0, there was a network error, and |bytes_read| is a value
+  // from "net::ERR_".
+
+  if (bytes_read == 0) {
+    bytes_read = net::ERR_CONNECTION_CLOSED;
+  }
+
+  if (bytes_read > 0) {
+    // Dispatch "onReceive" event.
+    sockets_tcp::ReceiveInfo receive_info;
+    receive_info.socket_id = params.socket_id;
+    receive_info.data = std::string(io_buffer->data(), bytes_read);
+    scoped_ptr<base::ListValue> args =
+        sockets_tcp::OnReceive::Create(receive_info);
+    scoped_ptr<Event> event(
+        new Event(sockets_tcp::OnReceive::kEventName, args.Pass()));
+    PostEvent(params, event.Pass());
+
+    // Post a task to delay the read until the socket is available, as
+    // calling StartReceive at this point would error with ERR_IO_PENDING.
+    BrowserThread::PostTask(
+        params.thread_id,
+        FROM_HERE,
+        base::Bind(&TCPSocketEventDispatcher::StartRead, params));
+  } else if (bytes_read == net::ERR_IO_PENDING) {
+    // This happens when resuming a socket which already had an
+    // active "read" callback.
+  } else {
+    // Dispatch "onReceiveError" event but don't start another read to avoid
+    // potential infinite reads if we have a persistent network error.
+    sockets_tcp::ReceiveErrorInfo receive_error_info;
+    receive_error_info.socket_id = params.socket_id;
+    receive_error_info.result_code = bytes_read;
+    scoped_ptr<base::ListValue> args =
+        sockets_tcp::OnReceiveError::Create(receive_error_info);
+    scoped_ptr<Event> event(
+        new Event(sockets_tcp::OnReceiveError::kEventName, args.Pass()));
+    PostEvent(params, event.Pass());
+
+    // Since we got an error, the socket is now "paused" until the application
+    // "resumes" it.
+    ResumableTCPSocket* socket =
+        params.sockets->Get(params.extension_id, params.socket_id);
+    if (socket) {
+      socket->set_paused(true);
+    }
+  }
+}
+
+// static
+void TCPSocketEventDispatcher::PostEvent(const ReadParams& params,
+                                         scoped_ptr<Event> event) {
+  DCHECK(BrowserThread::CurrentlyOn(params.thread_id));
+
+  BrowserThread::PostTask(BrowserThread::UI,
+                          FROM_HERE,
+                          base::Bind(&DispatchEvent,
+                                     params.browser_context_id,
+                                     params.extension_id,
+                                     base::Passed(event.Pass())));
+}
+
+// static
+void TCPSocketEventDispatcher::DispatchEvent(void* browser_context_id,
+                                             const std::string& extension_id,
+                                             scoped_ptr<Event> event) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  content::BrowserContext* context =
+      reinterpret_cast<content::BrowserContext*>(browser_context_id);
+  if (!extensions::ExtensionsBrowserClient::Get()->IsValidContext(context))
+    return;
+
+  EventRouter* router = ExtensionSystem::Get(context)->event_router();
+  if (router)
+    router->DispatchEventToExtension(extension_id, event.Pass());
+}
+
+}  // namespace core_api
+}  // namespace extensions